function nrcll()
{
//1
var ranNum= Math.round(Math.random() * 1);
if (ranNum == 0){document.write('<img src="http://www.nrcll.org/banner1.gif">'); } // banner1
if (ranNum == 1){document.write('<img src="http://www.nrcll.org/banner2.gif"'); } // banner2
}